Product Description
**Untested.l, functionality unknown**


Vintage Antique 1930''s Radio Co. Impedance Bridge Type 650-A


"Impedance bridges compare electrical impedances, which may contain inductance, capacitance, and resistance.

They use a method similar to that employed by Wheatstone bridges, which use a four-arm bridge circuit to compare an unknown resistance to that of a known standard."


*The Type 650-A was introduced in 1933 and was popular based on its flexibility and utility. The 650-A was one of the best-selling instruments by the General Radio Co!!!


More info:

Rectangular wooden case with sloped top; black instrument panel on top surface; instrument panel features six connection posts for the external generator, a galvanometer meter under glass, nine black plastic knobs, four of which are mounted on metal scales, and five other metal connection posts along the right side and bottom

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